diff --git a/src/lib.rs b/src/lib.rs
index eb6baaab..db04adf0 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -11,9 +11,6 @@
 //! Note that this is the **API documentation** of **Optimization Engine**; to get started,
 //! you would rather check out the [documentation]().
 //!
-//!
-//!
-//!
 
 extern crate num;
 
@@ -29,39 +26,4 @@ pub mod matrix_operations;
 mod mocks;
 
 #[cfg(test)]
-mod tests {
-
-    #[allow(unused_imports)]
-    use super::*;
-
-    #[allow(unused_imports)]
-    use core::Optimizer;
-
-    use std::num::NonZeroUsize;
-
-    #[test]
-    fn t_access() {
-        let radius = 0.2;
-        let box_constraints = constraints::Ball2::new_at_origin_with_radius(radius);
-        let problem = core::Problem::new(
-            box_constraints,
-            super::mocks::my_gradient,
-            super::mocks::my_cost,
-        );
-        let gamma = 0.1;
-        let tolerance = 1e-6;
-
-        let mut fbs_cache =
-            core::fbs::FBSCache::new(NonZeroUsize::new(2).unwrap(), gamma, tolerance);
-        let mut fbs_engine = core::fbs::FBSEngine::new(problem, &mut fbs_cache);
-        let mut u = [0.0; 2];
-        let mut optimizer = core::fbs::FBSOptimizer::new(&mut fbs_engine);
-
-        let status = optimizer.solve(&mut u);
-
-        assert!(status.has_converged());
-        assert!(status.get_norm_fpr() < tolerance);
-        assert!((-0.14896 - u[0]).abs() < 1e-4);
-        assert!((0.13346 - u[1]).abs() < 1e-4);
-    }
-}
+mod tests;
diff --git a/src/tests.rs b/src/tests.rs
new file mode 100644
index 00000000..cf6558c7
--- /dev/null
+++ b/src/tests.rs
@@ -0,0 +1,28 @@
+use super::*;
+use core::Optimizer;
+use std::num::NonZeroUsize;
+
+#[test]
+fn t_access() {
+    let radius = 0.2;
+    let box_constraints = constraints::Ball2::new_at_origin_with_radius(radius);
+    let problem = core::Problem::new(
+        box_constraints,
+        super::mocks::my_gradient,
+        super::mocks::my_cost,
+    );
+    let gamma = 0.1;
+    let tolerance = 1e-6;
+
+    let mut fbs_cache = core::fbs::FBSCache::new(NonZeroUsize::new(2).unwrap(), gamma, tolerance);
+    let mut fbs_engine = core::fbs::FBSEngine::new(problem, &mut fbs_cache);
+    let mut u = [0.0; 2];
+    let mut optimizer = core::fbs::FBSOptimizer::new(&mut fbs_engine);
+
+    let status = optimizer.solve(&mut u);
+
+    assert!(status.has_converged());
+    assert!(status.get_norm_fpr() < tolerance);
+    assert!((-0.14896 - u[0]).abs() < 1e-4);
+    assert!((0.13346 - u[1]).abs() < 1e-4);
+}